New posts in proof-writing

Events that carry negative information

probability proof-verification proof-writing

Is this a valid deductive proof of $2^x \geq x^2$ for all $x \geq 4$?

For which natural numbers $n$ is $\sqrt n$ irrational? How would you prove your answer? [duplicate]

proof-writing proof-explanation

What is the correct way of disproving a mathematical statement?

Prove that $2^n$ does not divide $n!$

elementary-number-theory proof-verification proof-writing divisibility

Show that the closure of a set A is the smallest closed set containing A.

general-topology proof-verification proof-writing

Proving if $b^k = a$ and $\text{ord}(a) = n$ then $\text{ord}(b) = kn$.

group-theory reference-request proof-writing solution-verification

Properties of sequence

sequences-and-series combinatorics proof-writing

Show that every local homeomorphism is continuous and open therefore bijective local homeomorphism is a homeomorphism

general-topology functions proof-verification proof-writing proof-explanation

Proving every infinite set $S$ contains a denumerable subset

real-analysis elementary-set-theory proof-verification proof-writing proof-explanation

I am looking for class of math problems which are provable in ZF if and only if they are provable in ZFC

logic proof-writing set-theory riemann-hypothesis decidability

Prove $1+\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{3}}+\dots+\frac{1}{\sqrt{n}} > 2\:(\sqrt{n+1} − 1)$

discrete-mathematics proof-writing

Does every compact set in a normed space with a non-trivial interior has 2 path connected points in the boundary?

multivariable-calculus proof-writing compactness normed-spaces supremum-and-infimum

What is the proof of the Binomial Theorem, other than the induction method? How can we find the expansion of binomails with indices like 2n, 3n, 4n..?

proof-writing binomial-theorem

Prove that $A \subset B$ if and only if $A \cap B = A$

elementary-set-theory proof-writing

Prove that there is no smallest positive real number

proof-verification proof-writing alternative-proof

Proof: Is there a line in the xy plane that goes through only rational coordinates?

proof-verification proof-writing irrational-numbers rational-numbers

Using limits properties when proving using epsilon-delta definition.

calculus limits proof-writing epsilon-delta

Show that $A\cap B\subseteq A$ and $A\subseteq A\cup B$

elementary-set-theory proof-writing

Prove $|a+b|+|a-b| \geq |a|+|b|$

inequality proof-writing problem-solving